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Prop Starting point

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Old 07-21-2017, 08:29 PM
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Default Prop Starting point

Have a 04 Eliminator 300 eagle xp,bought with no power. Dropped in a set of 620hp 540's with 1.36 XR Drives with 1" spacer.What size prop should I start with? Never had 1.36 ratio drives on anything so no idea where to start.I have a set of stock 30p 4-blade bravo 1's,But I think they are way to big for the 1.36 ratio,Thanks!!!
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Old 07-21-2017, 10:19 PM
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The starting point is those 30 inch props. More than likely too much pitch, but if they can get you on plane, you might get an idea how much too much. Any data you can get will help to more accurately pick the next set.
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Old 07-22-2017, 02:18 AM
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The 30's should get you a decent baseline.
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Old 07-22-2017, 09:44 AM
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I'm around 550hp a side in a 30ft hull, 1.36 drives with 24p 5 blades - I would look to try a 26 or 28p or like mentioned try the 30p and see what you got
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Old 07-22-2017, 07:34 PM
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Wanted to start with something closer to what I will need.I was thinking 26's or 28's.But you all opened my eyes and the 30's are realy not that far off. Gona give it a shot as soon as my tails come in,Thanks!!!
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Old 08-27-2017, 02:49 PM
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Finally got the boat out for a run,with the 30's it got on plane fairly quick with a little blow out at 3000 rpm.Drives tucked,boat was real flat.very sensitive to trim,realy freed up with a little trim.cruised 55mph @ 4000.roll into it and it accelerates hard and hits 82 @5000 in no time but starts to bow hop and chine walk.take some trim out and it coms down.boat feels like it realy wants to go! didn't try messing with the tabs to see if it would help.gona give Brett @ BBlades a call tomorrow.What you guys think? Thanks!!!!!
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Old 08-27-2017, 09:07 PM
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You have hit 5000. Means they are not too big. Surprised me. Pleasantly. Woulda sucked if you bought a pair of 26's and had to pull power as it was going by 6500. Blade count may a factor in making it more user-friendly. This is gonna be a touchy, sensitive, frisky boat. Long learning curve on trim and tabs. Might wanna try pulling the spacers to see how much worse it gets. Where do you run it?
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Old 08-28-2017, 10:27 AM
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Surprise the crap out of me too!! I figured 46 maybe 4800 max .Still have 400 to 600 rpm to play with. Motors make peak horsepower @ 5400.gona try 28's this weekend.are usually come out of the Mullica River and head out to AC a I usually come out of the Mullica River and head out the AC Inlet.
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Old 08-28-2017, 12:58 PM
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Labbing the 30's to 5300 with added rake might be the ticket.
I do believe tabs might still be required in small quantities.
We have test props available. I believe our new 4-SPEED 4 blades might be a good test.

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Old 08-28-2017, 03:57 PM
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Thanks Brett,I wanted to run it again yesterday and collect some more data before I called you but didn't make it out.You did a prop for my 250 xp last year and it worked out great!! I'll give you a call after work or tomorrow some time.Thanks a bunch!!!!!!!!!!!
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